Use of FASTOPEN and BASIC Application Causes "Disk Full" Error (61681)

SUMMARY

When FASTOPEN is loaded and the BASIC program listed below is executed, a "Disk full" error occurs. When FASTOPEN is not loaded, this error does not occur.

The following BASIC program creates a random file with a size of 64 MB, and then asks for a "START" and an "END" record within the file to write the records between "START" and "END":

OPEN "TESTDAT" FOR RANDOM AS #1 LEN = 1024
CLS
PRINT "************** Write into TESTDAT 1024 - Byte Records *********"
PRINT
INPUT "Start writing at record:"; START
INPUT "Stop writing at record :"; FINAL
FIELD #1, 1024 AS A$
LSET A$ = STRING$(1024, "H")
FOR I = START TO FINAL
        PUT 1, 65539
        PUT 1, I
        LOCATE 10, 10
        PRINT I
        IF INKEY$ = CHR$(27) THEN EXIT FOR
NEXT I
CLOSE
END
				

Microsoft has confirmed this to be a problem in MS-DOS versions 4.01 and 5.0. We are researching this problem and will post new information here as it becomes available.